Fix migration 103: users table uses workos_user_id as PK

[bokelley]

Summary

• Fixed foreign key references in migration 103 (sensitive_topics.sql)
• The users table uses workos_user_id VARCHAR(255) as its primary key, not id INTEGER

Problem

Migration 103 was failing with:

error: column "id" referenced in foreign key constraint does not exist

The flagged_conversations and known_media_contacts tables were trying to reference users(id) which doesn't exist.

Fix

Changed:

reviewed_by INTEGER REFERENCES users(id)
added_by INTEGER REFERENCES users(id)

To:

reviewed_by VARCHAR(255) REFERENCES users(workos_user_id)
added_by VARCHAR(255) REFERENCES users(workos_user_id)

Test plan

• All tests pass
• Verify migration runs successfully on Fly.io

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